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Practical Astronautics (1528 words) |
 | ascending node - the point on the orbit where the spacecraft crosses the equatorial plane moving from the southern hemisphere to the northern hemisphere. |
| 180 degrees from the ascending node is the descending node. |
| LAN realtes the orbits orientation to the Prime Meridian. |
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Orbital Elements and Astronomical Terms (1242 words) |
| Figure 2): The angle between the plane of the orbit and the plane of the celestial equator for Earth orbiting satellites (or the plane of the ecliptic for sun orbiting satellites). |
| * Longitude of the Ascending Node, (W in Figure 2): The angle between the vernal equinox and the ascending node, measured counter-clockwise. |
| It is equal to the sum of the Argument of Perigee and the Longitude of the Ascending Node (W + w in figure 2). |
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